<div class="c-alpha">
    <div class="checkboard-wrap">
      <checkboard></checkboard>
    </div>
    <div class="gradient" :style="{background: gradientColor}"></div>
    <div class="container" v-el:container
        @mousedown="handleMouseDown"
        @touchmove="handleChange"
        @touchstart="handleChange">
      <div class="pointer" :style="{left: colors.a * 100 + '%'}">
        <slot><div class="picker"></div></slot>
      </div>
    </div>
</div>